Very nice and flexible plugin. I am trying to push the limits of the plugin and wanted to use it to create lists of users with a certain value from a list of values defined via s2member. Very much like regions and specialty on the demo page (http://directories.wpusersplugin.com/simple-user-list/). I've got it working to create the list, but i cannot use the shortcode to create a sub-list with people from only one region for example, while I can use a url with the same values.
e.g. this doesn't work, but the same values in a url works:
[userlist list=5 filter=show wp_s2member_custom_fields-region=Europe]
Different but related, I used Advanced Custom Fields to set up Regions as user fields to see if that worked (and linked this to a custom taxonomy to fill in the regions), but that returned field_51cd002fad748 upon trying to display those values. Too bad.
For the rest, very nice plugin!